PLA2R1 and systemic lupus erythematosus: NR: not reported; CNTN1: anti-contactin-1; eGFR: estimated glomerular filtration rate, ANCA: antineutrophil cytoplasmic antibodies; LAC: lupus anticoagulant; ANA: antinuclear antibodies; ENA: extractable nuclear antigens; MN: membranous nephropathy; PLA2R: phospholipase A2 receptor; IgG: immunoglobulin G; CIDP: chronic inflammatory demyelinating polyneuropathy; SLE: systemic lupus erythematosus